I think if the tank is large enuff, a BTA is fine. IME, I've kept P. volitans with a BTA as well as a Cerianthus with no problems. I wouldn't trust ANYTHING with a carpet 'nem tho.
As mentioned, I wouldn't count on a lion to not eat a clownfish at all, even a full-grown maroon if the lion in question is an adult volitans. That being said, proportionally, our P. antennata has one of the biggest mouths out of all the lions we keep, so it's possible that it could try, assuming it's a large adult.
Adam,
Refresh my memory as to tank size. I think if the tank is large enuff, a BTA is fine. IME, I've kept P. volitans with a BTA as well as a Cerianthus with no problems. I wouldn't trust ANYTHING with a carpet 'nem tho.
In my tank I have a maroon and a lion fish and a anemone ant hey r fine
Additionally, lions might be considered aggressive, but they're about as passive as a fish gets in terms of temperament, and if there are aggressive fish or fast swimmers in their tanks, they tend to perch and remain in the background a lot more than if they aren't bugged by their tankmates.